Thermophoresis of microemulsion droplets: Size dependence of the Soret effect

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  • Politecnico di Milano


Thermophoresis, akin to thermal diffusion in simple fluid mixtures, consists of particle drift induced by a temperature gradient. Notwithstanding its practical interest, the dependence of thermophoretic effects on particle size R is still theoretically and experimentally debated. By performing measurements of water-in-oil microemulsion droplets with tunable size, we show that the thermal diffusion coefficient, at least for a suspension of small particles in a nonpolar solvent, does not appreciably depend on R.


Original languageEnglish
Article number040401
JournalPhysical Review E (Statistical, Nonlinear, and Soft Matter Physics)
Issue number4
Publication statusPublished - 2 Apr 2007